package com.mszlu.blog.service;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.mszlu.blog.dao.mapper.ArticleMapper;
import com.mszlu.blog.dao.pojo.Article;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Component;


@Component
public class ThreadService {
    //期望此操作在线程池执行 不会影响原有的主线程
    @Async("taskExecutor")
    public void updateArticleViewCount(ArticleMapper articleMapper, Article article){

        int viewCounts = article.getViewCounts();
        Article articleUpdated = new Article();
        articleUpdated.setViewCounts(viewCounts+1);
        LambdaQueryWrapper<Article> updateWrapper = new LambdaQueryWrapper<>();
        updateWrapper.eq(Article::getId,article.getId());
        //设置一个 为了在多线程的环境下 线程安全
        updateWrapper.eq(Article::getViewCounts,viewCounts);
        //update article set view_count=100 where view_count=99 and id =11
        articleMapper.update(articleUpdated,updateWrapper);
        try {
            Thread.sleep(5000);
            System.out.println("更新完成之后.....");
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

    }

}




